"She was a terrible influence on me," the American Hustle star, 23, admitted on NBC's Late Night With Seth Meyers Wednesday. "We left and then she was like, 'Meet me at the bar.' So I snuck out and I was like, 'Oh, my god!' I can't do this!' And she was like, 'You can do whatever you want!' We ran into Brad Pitt and she was like, 'Get Brad Pitt over here!' I was like, 'I can't do that!' And she was like, 'Yes you can!' So I just went, 'Hey, Brad Pitt!' He came over. He smelled like sandalwood. It was unbelievable."

Later at the Oscars after party, J-Law was in high spirits and couldn’t handle herself.

"I've never gone out after Golden Globes or Oscars or anything. I'm just so sick of people by that point. I'm like, 'Ugh, god!' But this time I was like, 'I'm going out.' And I puked all over," the actress admitted.

She attended Guy Oseary and Madonna's "big, fancy party” with Laura. "If you get invited you're, like, super important," the X-Men: Days of Future Past star joked. "And I puked on his porch. I was in such bad condition and I look behind me while I'm puking and Miley Cyrus is there, like, 'Get it together.'"